113402581 has 4 divisors (see below), whose sum is σ = 118333152. Its totient is φ = 108472012.

The previous prime is 113402579. The next prime is 113402591. The reversal of 113402581 is 185204311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185204311 = 43 ⋅4307077.

It is a cyclic number.

It is not a de Polignac number, because 113402581 - 2¹ = 113402579 is a prime.

It is a super-2 number, since 2×113402581² = 25720290754923122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113402551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2465251 + ... + 2465296.

It is an arithmetic number, because the mean of its divisors is an integer number (29583288).

Almost surely, 2^113402581 is an apocalyptic number.

It is an amenable number.

113402581 is a deficient number, since it is larger than the sum of its proper divisors (4930571).

113402581 is an equidigital number, since it uses as much as digits as its factorization.

113402581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930570.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 113402581 is about 10649.0647946193. The cubic root of 113402581 is about 484.0322659659.

Adding to 113402581 its reverse (185204311), we get a palindrome (298606892).

The spelling of 113402581 in words is "one hundred thirteen million, four hundred two thousand, five hundred eighty-one".